20.1.2.2.22 grpSpPr
This element specifies the properties that are to be common across all of the shapes within the corresponding group. If there are any conflicting properties within the group shape properties and the individual shape properties then the individual shape properties should take precedence.
Attributes
bwMode (Black and
Specifies that the group shape should be rendered using only black and white coloring.
White Mode)
That is the coloring information for the group shape should be converted to either black or white when rendering the corresponding shapes.
No gray is to be used in rendering this image, only stark black and stark white.
[Note: This does not mean that the group shapes themselves are stored with only black and white color information. This attribute instead sets the rendering mode that the shapes use when rendering. end note]
The possible values for this attribute are defined by the ST_BlackWhiteMode simple type (20.1.10.10).
[Note: The W3C XML Schema definition of this element’s content model (CT_GroupShapeProperties) is located in A.4.1. end note]